/**
 * 收到请求时，把网页响应回去
 * http://localhost:8081/
 * 将index.html相应到前端
 */
const http = require("http");
const url = require("url");
const fs = require("fs");
const path = require("path");
const https = require("https");
const cheerio = require("cheerio");

var reqUrl = "https://maoyan.com/films";
var movieList = [];

//创建监听端口
http.createServer((req, res) => {
    //获取资源路径
    var urlObj = url.parse(req.url);
    var pathname = urlObj.pathname;
    if(pathname == "/"){
        //异步读取文件
        var filePath = path.join(__dirname, "/index.html");
        fs.readFile(filePath, (err, data) => {
            if(err){
                console.log(err);
            }else{
                res.writeHead(200, {"Content-Type": "text/html;charset=utf8"});
                res.write(data);
                res.end();
            }
        })
    }
    else if(pathname == "/getlist"){
        https.get(reqUrl, (resObj) => {
            var htmlStr = "";
            resObj.on("data", (chunk) => {
                htmlStr += chunk;
            })
            resObj.on("end", () => {
                var $ = cheerio.load(htmlStr);
                $(".movie-item-title a").each((i, el) => {
                    var movieName = $(el).text();
                    var movieId = $(el).attr("data-val");
                    movieId = movieId.slice(movieId.indexOf(":")+1, -1);
                    var num1 = $(el).parent().next().children(".integer").text();
                    var num2 = $(el).parent().next().children(".fraction").text();
                    var rate = num1 + num2;
                    var movieObj = {movieId: movieId, movieName: movieName, movieRate: rate}
                    movieList.push(movieObj);
                })

                res.writeHead(200, {"Content-Type": "text/plain"});
                res.write(JSON.stringify(movieList));
                res.end();
            })
        })
    }
}).listen(8081)